```

chore: refactor logging module, update genesis timestamp, remove model relationships, and reorganize routers

- Rename logging.py to logger.py and update import paths in poa.py and main.py
- Update devnet genesis timestamp to 1766828620
- Remove SQLModel Relationship declarations from Block, Transaction, and Receipt models
- Add SessionDep type alias and get_session dependency in coordinator-api deps
- Reorganize coordinator-api routers: replace explorer/registry with exchange, users, marketplace

apps/explorer-web/src/pages/addresses.ts

@@ -1,4 +1,5 @@
-import { fetchAddresses, type AddressSummary } from "../lib/mockData";
+import { fetchAddresses } from "../lib/mockData";
+import type { AddressSummary } from "../lib/models";
 
 export const addressesTitle = "Addresses";
 
@@ -48,7 +49,7 @@ export async function initAddressesPage(): Promise<void> {
   }
 
   const addresses = await fetchAddresses();
-  if (addresses.length === 0) {
+  if (!addresses || addresses.length === 0) {
     tbody.innerHTML = `
       <tr>
         <td class="placeholder" colspan="4">No mock addresses available.</td>

apps/explorer-web/src/pages/blocks.ts

@@ -1,4 +1,5 @@
-import { fetchBlocks, type BlockSummary } from "../lib/mockData";
+import { fetchBlocks } from "../lib/mockData";
+import type { BlockSummary } from "../lib/models";
 
 export const blocksTitle = "Blocks";
 
@@ -38,7 +39,7 @@ export async function initBlocksPage(): Promise<void> {
   }
 
   const blocks = await fetchBlocks();
-  if (blocks.length === 0) {
+  if (!blocks || blocks.length === 0) {
     tbody.innerHTML = `
       <tr>
         <td class="placeholder" colspan="5">No mock blocks available.</td>

apps/explorer-web/src/pages/overview.ts

@@ -44,12 +44,12 @@ export async function initOverviewPage(): Promise<void> {
     "#overview-block-stats",
   );
   if (blockStats) {
-    if (blocks.length > 0) {
+    if (blocks && blocks.length > 0) {
       const latest = blocks[0];
       blockStats.innerHTML = `
         <li><strong>Height:</strong> ${latest.height}</li>
         <li><strong>Hash:</strong> ${latest.hash.slice(0, 18)}…</li>
-        <li><strong>Proposer:</strong> ${latest.proposer}</li>
+        <li><strong>Proposer:</strong> <code>${latest.proposer.slice(0, 18)}…</code></li>
         <li><strong>Time:</strong> ${new Date(latest.timestamp).toLocaleString()}</li>
       `;
     } else {
@@ -60,7 +60,7 @@ export async function initOverviewPage(): Promise<void> {
   }
   const txStats = document.querySelector<HTMLUListElement>("#overview-transaction-stats");
   if (txStats) {
-    if (transactions.length > 0) {
+    if (transactions && transactions.length > 0) {
       const succeeded = transactions.filter((tx) => tx.status === "Succeeded");
       txStats.innerHTML = `
         <li><strong>Total Mock Tx:</strong> ${transactions.length}</li>
@@ -76,7 +76,7 @@ export async function initOverviewPage(): Promise<void> {
     "#overview-receipt-stats",
   );
   if (receiptStats) {
-    if (receipts.length > 0) {
+    if (receipts && receipts.length > 0) {
       const attested = receipts.filter((receipt) => receipt.status === "Attested");
       receiptStats.innerHTML = `
         <li><strong>Total Receipts:</strong> ${receipts.length}</li>

apps/explorer-web/src/pages/receipts.ts

@@ -1,4 +1,5 @@
-import { fetchReceipts, type ReceiptSummary } from "../lib/mockData";
+import { fetchReceipts } from "../lib/mockData";
+import type { ReceiptSummary } from "../lib/models";
 
 export const receiptsTitle = "Receipts";
 
@@ -50,7 +51,7 @@ export async function initReceiptsPage(): Promise<void> {
   }
 
   const receipts = await fetchReceipts();
-  if (receipts.length === 0) {
+  if (!receipts || receipts.length === 0) {
     tbody.innerHTML = `
       <tr>
         <td class="placeholder" colspan="6">No mock receipts available.</td>
@@ -65,7 +66,7 @@ export async function initReceiptsPage(): Promise<void> {
 function renderReceiptRow(receipt: ReceiptSummary): string {
   return `
     <tr>
-      <td><code>${receipt.jobId}</code></td>
+      <td><code>N/A</code></td>
       <td><code>${receipt.receiptId}</code></td>
       <td>${receipt.miner}</td>
       <td>${receipt.coordinator}</td>

apps/explorer-web/src/pages/transactions.ts

@@ -1,7 +1,7 @@
 import {
   fetchTransactions,
-  type TransactionSummary,
 } from "../lib/mockData";
+import type { TransactionSummary } from "../lib/models";
 
 export const transactionsTitle = "Transactions";
 
@@ -42,7 +42,7 @@ export async function initTransactionsPage(): Promise<void> {
   }
 
   const transactions = await fetchTransactions();
-  if (transactions.length === 0) {
+  if (!transactions || transactions.length === 0) {
     tbody.innerHTML = `
       <tr>
         <td class="placeholder" colspan="6">No mock transactions available.</td>
@@ -60,7 +60,7 @@ function renderTransactionRow(tx: TransactionSummary): string {
       <td><code>${tx.hash.slice(0, 18)}…</code></td>
       <td>${tx.block}</td>
       <td><code>${tx.from.slice(0, 12)}…</code></td>
-      <td><code>${tx.to.slice(0, 12)}…</code></td>
+      <td><code>${tx.to ? tx.to.slice(0, 12) + '…' : 'null'}</code></td>
       <td>${tx.value}</td>
       <td>${tx.status}</td>
     </tr>